Another Cool Math Trick!

I love math tricks and so do my students! They are a great way to get kids thinking about numbers and operations whilst adding a bit of 'magic' to the process. Below is a fantastic math trick you could try with your kids that will get them multiplying, adding, doubling, dividing and subtracting . . . and if done right the answer will always be 15 no matter what number was chosen in step 1!

I like to use these at the start of a math lesson for a quick math mental warm up, or if there are a few precious minutes to spare that need to be filled with something educational. 

I've included an example of the process underneath the image below.

Example:

Step 1: I'm thinking 100
Step 2: 100 X 3 = 300
Step 3: 300 + 45 = 345
Step 4: Double 345 = 690
Step 5: 690/6 = 115
Step 6: 115 - 100 = 15!